George hand smith



{No Model.) 2 Sheets-Sheet 1.

G. H. SMITH.

APPARATUS POR THE MANUFACTURE OF WHITE LEAD. No. 803,277. Patented. Aug. 12,1884.

(No Model.)

iv 2 Sheets-Sheet 2. G. E. SMITH.

APPARATUS FOR THE MANUFACTURE OF WHITE LEAD. No. 303,277.

Patented Au 12; 1884.

..-...III. I ll... I IIIIIII I Kl |||l l llullullanulnbillll Nrrnn STATES i n'rsisr @rrrcra v GEORGE HAND SMITH, OF LONDON, COUNTY OF MIDDLE-SEX, ENGLAND.

APPARATUS EOR THE MANUFACTURE OF WHITE LEAD.

SFECIEICATION forming part of Letters Patent No. 303,277, dated August 12, 1884.

Application filed October 4, 1883.

(No model.)

My invention relates to improved appara tus for use in the manufacture of white lead, by which a more efficient control of the constituent elements may be attained to secure their more eflicient treatment and more effectual combination, so as to obtain more rapid and economical production of white lead of good marketable quality, like in character to the white lead of the Dutch or Anglo-Dutch process. The blue or metallic lead,in opera-- tion with this apparatus, is subjected to the corrosive action of a mixture of air and carbonicacid gas, in suitable relativ e proportions, heated and charged with aqueous vapor and acetic acid within a closed receptacle, the me tallic lead inthe chamber being perforated or in sheets or disintegrated, or otherwise so reduced as to give the most favorable exposure to corrosive action.

Figure 1 shows a longitudinal section of the apparatus. Fig. 2 is a transverse section of the same, and Fig. 3 is a sectional plan view thereof.

c1. indicates the chamber where the lead in a metallic state is placed to be operated upon by corrosion to form the white lead of com-' merce, and this chamber a is accessible by openings or doors at ab c" in the walls of that chamber, and of the surrounding heat-retain ing air-cells b o.

d is a saturator supplying air saturated with moisture to the chamber a by a pipe, (2, which pipehas a contracted orifice within the chamber a.

a series of porous 'diaphragrns, (shown by (lot ted lines'cl at intervals therein,) which hold suspended a mixture of water and acetic acid placed therein, and giving off the same to air traversing that saturator din its course to the chamber a, under pressure, and this air is This saturat-or d is provided with.

heated prior to its entering the satulator d, by its traversing the serpent-inc pipe (l in its passagefrom a suitable source of air and carbonic-acidgas supply under pressure, such as a pump, bellows, or gasometcrchamber. The chamber a is supported above the level of a tray or channel for liquid, formed by the lower parts oftheheat-retaining cells D c at b,throughout which the contained liquid may circulate, and within this liquid the saturator (Z is placed for the purpose of being heated. Beneath this tray 1) is formed the water-bath h, for conveying equally to the whole apparatus the heat supplied by the gasburners e.

h is a supplypipe, and 72? a draw-off to the bath h, and D U are like pipes to the inner liquid-receptacles, I).

f is a pipe for the escape of surplus atmos, -phere from the lead-chamber a.

g is a thermometer, for indicating the team perat-ure of that chamber, and a like indicator is applied to the water-bath h, but is not shown. Valves, regulators, and indicators are also applied to the gas-supply pipes to the burners e in manner well understood, and not necessary to show in the drawings. The curved roofs to the chamber a and heat-retaining cells I) and cserve to carry down any moisture which might condense thereon, and prevent dripping of moisture onto the lead or collection thereof on those roofs. The arrows show the direction of flow of the air through the saturator and heater to the lead-chamber a.

The operation as carried on with this apparatus is as follows: The prepared metallic lead is, as already mentioned, placed in the chamber a, closed, and this chamber is heated to about 120 to lit) Fahrenheit, and then the cock controlling the pipe (1 is turned, permitting the inflow of the corroding moisture laden air, and this air, under pressure, on ontering the chamber a expands and reduces the temperature, while the gaseous air is most effectually saturated with moisture in the pres ence of the lead, and a most efficicnt chemical action is set up resulting in an increased production of white lead.

The carbonicacid gas may be enerated by plied to the pipe (2*,

I clai In testimony whereof Iaflix my signature in In apparatus for use in the manufacture of the presence of two Witnesses. white lead, the combination of the corrodingchamber a, heat-retaining cells I) and c, satu- GEORGE HAND SMITH. 5 rator d, with its delivery and heating pipes df (P, water bath, and heating means, substan- \Vitnesses:

tiaily as and for the purpose specified, and FRED DONNISON,

shown in the drawings. JOHN ALFRED DONNISON. 

